The correct option would be B. consent can be obtained from adult stem cell donors.
The controversy behind the other option is that it is a form of life, but no consent is taken from the actual life. (i know it's phrased weirdly, my bad)
Consent can be obtained from adult stem cell donors.
Explanation:
Considered very special cells, stem cells appear in humans even during the embryonic phase, that is, even before birth. As soon as the baby comes into the world, some organs still hold a small portion of stem cells within them, which become responsible for the constant renewal of that specific organ. The extraction of these stem cells has been the subject of controversy for years. This is because many people believe that it is an invasion of the baby's body that does not have the capacity to consent and protect its own organism.
However, some of these stem cells accompany the human being until adulthood (in smaller quantities than the baby) the extraction of these cells in adults is less controversial, because unlike the baby the adult can consent to the manipulation of his organism.
Precipitation differences are the factor that does not contribute to "water stress" on the Earth.
<u>Explanation:</u>
Less ocean water sources, population differences, Scarcity of economic water resources are the factor which leads to water stress on the Earth.
Precipitation differences do not cause much difference in water stress. So it will not contribute to the water stress.
An increase in population will cause major water stress because availability drinking water is less in the earth. Population increase can cause a major problem.
